noun
ream
REEM/riːm/
A bundle of paper, usually containing 500 sheets.
Several reams of paper form the tall load on the handcart.
Etymology
The original “bundle” became a standard measure of paper. From that concrete quantity, ream broadened to mean a large amount, especially of paper or writing.
In context
A paper ream is a standard unit used in offices to measure and order paper. The most common definition of a ream is 500 sheets of paper of the same size and quality.